feat: show default file icon when nvim-devicon is not installed (#696)

lua/nvim-tree/colors.lua

@@ -79,7 +79,7 @@ local function get_links()
 end
 
 function M.setup()
-  if config.get_icon_state().show_file_icon then
+  if config.get_icon_state().show_file_icon and config.get_icon_state().has_devicons then
     require'nvim-web-devicons'.setup()
   end
   local higlight_groups = get_hl_groups()

lua/nvim-tree/config.lua

@@ -60,10 +60,11 @@ function M.get_icon_state()
 
   local has_devicons = pcall(require, 'nvim-web-devicons')
   return {
-    show_file_icon = show_icons.files == 1 and has_devicons,
+    show_file_icon = show_icons.files == 1,
     show_folder_icon = show_icons.folders == 1,
     show_git_icon = show_icons.git == 1,
     show_folder_arrows = show_icons.folder_arrows == 1,
+    has_devicons = has_devicons,
     icons = icons
   }
 end

lua/nvim-tree/renderer/init.lua

@@ -56,6 +56,7 @@ end
 
 local get_file_icon = function() return "" end
 if icon_state.show_file_icon then
+  if icon_state.has_devicons then
     local web_devicons = require'nvim-web-devicons'
 
     get_file_icon = function(fname, extension, line, depth)
@@ -73,7 +74,11 @@ if icon_state.show_file_icon then
         return #icon_state.icons.default > 0 and icon_state.icons.default..icon_padding or ""
       end
     end
-
+  else
+    get_file_icon = function()
+      return #icon_state.icons.default > 0 and icon_state.icons.default..icon_padding or ""
+    end
+  end
 end
 
 local get_symlink_icon = function() return icon_state.icons.symlink end